GMP used during 3 and a half years to solve MIT's LCS35

Torbjörn Granlund tg at
Wed May 8 23:43:47 UTC 2019

Bernard Fabrot <bfabrot at> writes:

  If anyone could test this on an older GMP version / older hardware it would
  be amazing.  Actually tests on more recent hardware (like i9 or AMD) would
  be great too.

Note that i5 or i7 or i9 are no different when it comes to CPU core
performance if they come from the same generation.  (And furthermore,
Intel's generation 5, 6, 7, 8, 9 are really no different, they are just
Skylake cores renamed.  Older generations did really improve things,

A 3.6 GHz Skylake (boosting to 4 GHz) needed 46/36 seconds for your
test using current GMP code.

A 3.7 GHz Ryzen 2700X (boosting to 4.3 GHz) needed 43/35 seconds for
your test using current GMP code.

The test on hardware from 1999 using GMP 2.0.2 as well as the same
hardware using current GMP is running.  I will take about 10 hours.

Please encrypt, key id 0xC8601622

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